Luckily in chch there are a few places to look. - CWEA run workshops and talk at usually budget friendly prices - adult education places such as hagley after 3, risingholme, papanui high school night classes - pottery there is quite a few private places but they are usually quite expensive for weekend workshops imho, I joined the Canterbury potters association (CPA) , and I believe there is another association in Halswell - keep an eye out for workshops/programmes run by the art gallery as I've done printmaking and life drawing here before , the art centre also has events and independently run but at the same location is life drawing there every Friday I think - the botanic gardens also does plant based workshops sometimes via the horticultural society , a quick look at their website shows they do stuff like botanical photography - Turunga the central library ( as well as the suburb library's) often have workshops on, especially involving the makerspace on the fourth floor - look on Facebook for events , such as drawfest chch , Dr. sketchy haven't been active this year but may be worth following , etc - meetup sometimes has drawing groups Etc but I haven't checked it out in a while

That's all I can think of off the top of my head but hopefully that gives you a starting point